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- From 189a2fe96931ef3ea0e187c8e9bfa589c2a0ae10 Mon Sep 17 00:00:00 2001
- From: Weijie Gao <[email protected]>
- Date: Mon, 25 Jul 2022 17:24:56 +0800
- Subject: [PATCH 62/71] mtd: ubi: add support for UBI end-of-filesystem marker
- used by OpenWrt
- Add support for UBI end-of-filesystem marker used by OpenWrt to allow
- attaching a new UBI mtd partition just upgraded.
- Signed-off-by: Weijie Gao <[email protected]>
- ---
- drivers/mtd/ubi/attach.c | 25 ++++++++++++++++++++++---
- drivers/mtd/ubi/ubi.h | 1 +
- 2 files changed, 23 insertions(+), 3 deletions(-)
- --- a/drivers/mtd/ubi/attach.c
- +++ b/drivers/mtd/ubi/attach.c
- @@ -803,6 +803,13 @@ out_unlock:
- return err;
- }
-
- +static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
- +{
- + return ech->padding1[0] == 'E' &&
- + ech->padding1[1] == 'O' &&
- + ech->padding1[2] == 'F';
- +}
- +
- /**
- * scan_peb - scan and process UBI headers of a PEB.
- * @ubi: UBI device description object
- @@ -833,9 +840,21 @@ static int scan_peb(struct ubi_device *u
- return 0;
- }
-
- - err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
- - if (err < 0)
- - return err;
- + if (!ai->eof_found) {
- + err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
- + if (err < 0)
- + return err;
- +
- + if (ec_hdr_has_eof(ech)) {
- + pr_notice("UBI: EOF marker found, PEBs from %d will be erased\n",
- + pnum);
- + ai->eof_found = true;
- + }
- + }
- +
- + if (ai->eof_found)
- + err = UBI_IO_FF_BITFLIPS;
- +
- switch (err) {
- case 0:
- break;
- --- a/drivers/mtd/ubi/ubi.h
- +++ b/drivers/mtd/ubi/ubi.h
- @@ -746,6 +746,7 @@ struct ubi_attach_info {
- int mean_ec;
- uint64_t ec_sum;
- int ec_count;
- + bool eof_found;
- struct kmem_cache *aeb_slab_cache;
- };
-
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